This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A075686 #11 Jul 11 2015 00:41:30 %S A075686 0,4,7,26,28,127,199,296,511,3119,16861,18164,19453,20468,270824 %N A075686 In base 4, n sets a new record for the number of Reverse and Add! steps needed to reach a palindrome starting with n. %C A075686 RECORDS transform of A075685. - Base-4 analog of A065198 (base 10) and A066144 (base 2). Integers like 290, for which a palindrome is (presumably) never reached (cf. A075420), are of course disregarded. A075687 gives the corresponding records. %H A075686 N. J. A. Sloane, <a href="/transforms.txt">Transforms</a> %H A075686 <a href="/index/Res#RAA">Index entries for sequences related to Reverse and Add!</a> %e A075686 Starting with 26, 3 Reverse and Add! steps are needed to reach a palindrome; starting with n < 26, less (at most 2) steps are needed. %Y A075686 Cf. A065198, A066144, A075420, A075685, A075687. %K A075686 base,more,nonn %O A075686 0,2 %A A075686 _Klaus Brockhaus_, Sep 24 2002